[deps] upgrade dev dependencies

package.json

@@ -22,7 +22,7 @@
     "duniter",
     "dup"
   ],
-  "author": "Elois <elois@ifee.fr>",
+  "author": "Elois <elois@duniter.org>",
   "license": "AGPL-3.0",
   "bugs": {
     "url": "https://git.duniter.org/tools/dup-tools-front/issues"
@@ -30,9 +30,9 @@
   "homepage": "https://git.duniter.org/tools/dup-tools-front#readme",
   "devDependencies": {
     "dup-tools-wasm": "0.1.1",
-    "webpack": "^4.16.3",
+    "webpack": "^4.29.3",
     "webpack-cli": "^3.1.0",
     "webpack-dev-server": "^3.1.5",
-    "copy-webpack-plugin": "^4.5.2"
+    "copy-webpack-plugin": "^5.0.0"
   }
 }